Just a update on those cheap carts.
A selection of carts have arrived and I'm adding support to the Joey to re-write them. Specs for the cheapest LSDJ suitable cart are:
2Mbytes Flash ROM
128kbytes SRAM, accessable as a single 128k block (As required by LSDJ)
MBC5 mapper, up to 512 banks.
Replacable lithium coin cell for RAM retention.
There is a little bit of work to do on the carts before they are flashable, removing the TSOP48 Flash IC, cutting and routing a few traces, re-soldering. I was hoping this wouldn't be necessary.
The price target remains the same, about half that of existing BV carts. If there is enough interest - (pre-orders?) - that would allow me to drive the price down further by saving more on shipping, maybe even to the $10/cart price point.